diff --git a/src/controllers/n-grams.js b/src/controllers/n-grams.js
index 5ed7d37..b02e604 100644
--- a/src/controllers/n-grams.js
+++ b/src/controllers/n-grams.js
@@ -8,6 +8,62 @@ async function Init() {
     });
 }
 
+// probability of trigram/bigram
+const BigramCommonality = {
+    th: 1.52,
+    he: 1.28,
+    in: 0.94,
+    er: 0.94,
+    an: 0.82,
+    re: 0.68,
+    nd: 0.63,
+    at: 0.59,
+    on: 0.57,
+    nt: 0.56,
+    ha: 0.56,
+    es: 0.56,
+    st: 0.55,
+    en: 0.55,
+    ed: 0.53,
+    to: 0.52,
+    it: 0.50,
+    ou: 0.50,
+    ea: 0.47,
+    hi: 0.46,
+    is: 0.46,
+    or: 0.43,
+    ti: 0.34,
+    as: 0.33,
+    te: 0.27,
+    et: 0.19,
+    ng: 0.18,
+    of: 0.16,
+    al: 0.09,
+    de: 0.09,
+    se: 0.08,
+    le: 0.08,
+    sa: 0.06,
+    si: 0.05,
+    ar: 0.04,
+    ve: 0.04,
+    ra: 0.04,
+    ld: 0.02,
+    ur: 0.02,
+};
+
+const TrigramCommonality = {
+    the: 1.81,
+    and: 0.73,
+    tha: 0.33,
+    ent: 0.42,
+    ing: 0.72,
+    ion: 0.42,
+    tio: 0.31,
+    for: 0.34,
+    oft: 0.22,
+    sth: 0.21,
+};
+
 function MostProbableAlternateQueries(query) {
     const words = query.split(' ');
 
@@ -24,17 +80,36 @@ function MostProbableAlternateQueries(query) {
 }
 
 function MostProbableMissSpelling(word) {
-    return [];
+    // First work out if it's intended to be a word
+
+    console.log(word);
+    return BiGrams(word);
 }
 
-function TriGrams(word) {
+function ConditionalTrigramProbability(token) {
 
 }
 
+function ConditionalBigramProbability(token) {
+
+}
+
+// returns list of tokens
+function TriGrams(word) {
+    return NGrams(word, 3);
+}
+
 function BiGrams(word) {
-
+    return NGrams(word, 2);
 }
 
+function NGrams(word, n) {
+    const tokens = [];
+    for (let i = 0; i < word.length - n + 1; i++) {
+        tokens.push(word.substring(i, i + n));
+    }
+    return tokens;
+}
 
 module.exports = {
     Init,